Planet immigrant water

Recently, a scientific study shows that researchers have discovered at least 24 planets that are more livable than the earth, but they are all outside the solar system. Can humans reach such a long distance? Did humans discover these so-called livable planets for immigration or for exploring life in space?

How livable are these "super livable" and "more livable than the earth" planets?

What is livable?

For a planet, its position in the galaxy is very important, which directly determines whether it is in the livable zone of a star system, whether it can get just the right light and heat, and whether it can store liquid water on its surface.

The existence of the atmosphere is also very important to the planet, which not only plays the role of heat preservation, but also blocks the ravages of cosmic radiation.

The existence of magnetic field can help the planet resist the damage of harmful particles from stars and give full play to the role of protective cover.

In addition, having your own defenders and neighbors with higher quality than yourself can help you reduce meteorite disasters. A bigger sky will directly attract meteorites.

Take the earth as an example. Our earth is in the livable zone of the solar system. Suitable temperature can store liquid water. And the earth has its own atmosphere and magnetic field, which can resist cosmic rays. Finally, the earth has its own natural satellites-neighbors of the moon and the solar system-to shelter itself from the wind and rain. Because of Jupiter's mass, many meteorites and celestial bodies in the solar system will be attracted by it, so that they will not hit the earth.

At present, scientists have continuously observed more than 4,000 exoplanets, many of which are very uninhabitable. For example, the temperature of KELT-9b planet is high enough to melt its atmosphere. Although the planet TrES-2b is dark, its atmospheric temperature still reaches 980 degrees Celsius. Gj433 d planet is too far away from the star, so it is a Neptune-like planet frozen in the cold.

Therefore, these "super livable" planets are very special. Similarly, these livable planets must also have suitable temperatures in the livable zone of their own star system to catalyze the evolution of life.

First of all, there must be a star of moderate size and suitable for life, which is the sun in our solar system. The evolution of life on earth has been going on for 3.5 billion years, and it is a very long process. Only in its heyday can a star system have enough time to wait for the germination of life.

Secondly, moderate mass and volume. Mars in the solar system cannot maintain its own atmosphere because of its small mass. Therefore, celestial bodies with greater mass and gravity have a thicker atmosphere and a larger land area, which means a broader habitat for life.

Besides, it is warmer and wetter than the earth. Some people don't understand, aren't we curbing the trend of global warming? Is a warmer environment than the earth suitable for living things? In fact, what living things can't stand is not the warming temperature, but the rapidly changing climate. On a more livable planet, the poles are not barren, the climate is very humid, there is no desert, and the living space of living things is broader.

Finally, the satellite of the super livable planet will be larger than the moon of the earth, which will help stabilize the orbit of the planet and prevent unnecessary disturbance from the launch of the planet.

According to these conditions put forward by scientists, they set some parameters and think that super livable planets should run in the orbit of K dwarfs. K-dwarf is a yellow dwarf with a life span of 5-8 billion years, which is 10% larger than the earth, with a temperature of 5 degrees Celsius higher than the earth and an oxygen content of 25%-30% in the atmosphere. It has a vast land and diverse landforms. The size of the satellite is 65,438+00% of its own volume, and the running distance is moderate.

1977, the "Voyager 1" launched by NASA is the farthest man-made detector from the earth. It has been flying in space for more than forty years. Then where is it now?

According to the current speed of Voyager 1, it will still take tens of thousands or even hundreds of thousands of years to fly to the next star system. Even in the three-body world, the distance of 4.2 light years has taken more than 400 years.

But human life span is not that long. In other words, even if humans find livable planets in other star systems, they can't reach them.

If so, what is the significance of human exploration of these livable planets?

Even if humans find intelligent life on these super livable planets, they are also far away from the earth, so what is the significance of contacting them? Can they reach the earth?

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